Event-driven programming

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Topic: Event-driven programming

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	Event-driven programming - Wikipedia, the free encyclopedia
		Programming an event driven system is thus a matter of rewriting the default trigger functions of the system, to match the required behavior.
		Event-driven programming stresses flexibility and asynchrony as virtues, and tries to be as modeless as possible.
		Event-driven programs typically consist of a number of small programs called event handlers, which are to be called in response to external events, and a dispatcher, which calls the event handlers, often using an event queue to hold unprocessed events.
	en.wikipedia.org /wiki/Event-driven_programming (556 words)

	Event driven programming language - Wikipedia, the free encyclopedia
		An event driven programming language is a programming language in which events (mouse clicks, key presses) cause portions of the code to execute.
		Most event-driven programming environments already provide this main loop, so it needs not be rewritten.
		The third step in developing an event-driven program is to write the "main loop": a function that checks for events, and then calls the matching event handler.
	en.wikipedia.org /wiki/Event_driven_programming_language (365 words)

	Kids.net.au - Encyclopedia Computer programming -
		See also event-driven programming, software, software documentation, programming language, computer science, software engineering, imperative programming, functional programming, cut and paste programming.
		Programming is the act of creating a computer program, a concrete set of instructions for a computer to carry out.
		The program is written in a programming language.
	www.kidsseek.com /encyclopedia-wiki/pr/Programming (430 words)

	What is Event-Driven Programming?
		Events are queued to this thread, which processes them in the order in which they were added to the queue.
		Event and message delivery are a major part of how windowing systems work, and therefore the messaging system must be efficient.
		Events are handled serially, to avoid timing conflicts among multiple events.
	www.rivier.edu /faculty/bhiggs/web/cs585aweb/Events/whatEvtDr.htm (322 words)

	Event Driven Programming Systems
		The destination for an event may be determined by a state variable such a mouse location or by an event handler having registered itself as a recipient for the particular event.
		Event handlers correspond to objects, and the processing routines to methods or members functions.
		Event handlers can be specified using a combination of text and graphics.
	www.sju.edu /~jhodgson/gui/event.html (137 words)

	Introduction into event-driven programming
		This program is already an example of event-driven programming.
		It is a general-purpose event queue, allowing to specify an arbitrary event source, to manage event handlers, and offering a system how the events are sent to the event handlers that can process them.
		Or, the program blocks because it waits until the output side is ready, but there have already input bytes arrived which cannot be read in because the program blocks.
	www.ocaml-programming.de /packages/documentation/equeue/users-guide/c34.html (1079 words)

	The cnet network simulator - event driven programming
		The cnet network simulator - event driven programming
		Events occur when a node reboots, the Application Layer has a message for delivery, the Physical Layer receives a frame on a link, a timer event expires, a debugging button (under Tcl/Tk) is selected, and a node is (politely) shutdown.
		When the handler's event eventually occurs, the same value is passed as the third parameter to the handler.
	www.csse.uwa.edu.au /cnet/eventdriven.html (729 words)

	Logtalk user manual: event-driven programming
		The need to associate computations to the occurrence of events was very early recognized in several knowledge representation languages, in some programming languages [Stefik 86, Moon 86], and in the implementation of operative systems [Tanenbaum 87] and graphical user interfaces.
		The notion of event allows the user not only to have the possibility of observing, but also of controlling and modifying an application behavior, namely by dynamically changing the observed events during program execution.
		Complementary to the notion of event is the notion of monitor.
	www.uc.pt /logtalk/manuals/userman/events.html (1447 words)

	ipedia.com: Event Article
		In common language, an event is something that happens (changes), in particular something special of limited duration, for example a major football match or pop music concert.
		In information processing, an event is a change in the properties received by an observer after being transmitted from an object.
		In Physics and in Science in general, an event may be contrasted with a process, which occurs across intervals, not just at a point on a timeline.
	www.ipedia.com /event.html (397 words)

	Computer programming/Event driven programming - Wikibooks, collection of open-content textbooks
		Computer programming/Event driven programming - Wikibooks, collection of open-content textbooks
		All bookshelves > Science > Computer Science > Computer Programming > Event driven programming
		In this type of programming, a section of code is written to respond to each event.
	en.wikibooks.org /wiki/Programming:Event_driven_programming (194 words)

	Fundamentals of Window Systems and Event Driven Programming
		Event Driven Programming underlies all modern window systems such as X and the various Microsoft Windows.
		Event driven programs have a structure that is quite different from batch programs and when run under a window system, they must rely on the window software facilities that tend to be quite complex.
		Prerequisite: Programming experience in C. There are no theoretical prerequisites but the course will be fast paced and assume that students have already written nontrivial batch programs in C. Undergraduate CS majors interested in the course should send e-mail to the instructor about possible arrangments.
	www.cs.sunysb.edu /~theo/s96.html (319 words)

	Applets and Event-Driven Programming
		Event-driven programs sit and wait for events to happen.
		Events are arranged in an event hierarchy, delivered (or fired) by event sources and handled by event listeners.
		Event listeners must be registered with a source in order to receive a particular event type.
	www.cs.newpaltz.edu /~pletcha/EventDrivenProgramming.html (1699 words)

	tutorial_details.aspx?tutorial_id=504
		The meat of event-driven programming is in the event-handlers.
		Event-driven programming vastly improves on older models because it transfers the flow of the program from the programmer to the user.
		If your program is event-driven, you can't assume a certain number of integers, you can't even assume that any integers have been entered at all.
	www.devhood.com /tutorials/tutorial_details.aspx?tutorial_id=504 (1416 words)

	Event-Driven Programming with Twisted and Python Linux Journal
		A new breed of frameworks for third-generation languages is taming the once complex world of event-driven programming.
		Plenty of explanations of asynchronous programming exist, but I think the best way to understand its benefits is to wait in line with an idle cashier.
		In the event of an error, self.outgoingProxyError is called with a Failure object, which brings us to error handling.
	www.linuxjournal.com /article/7871 (2629 words)

	Event driven programming
		Note that event-driven programming can be part of either an application or an applet.
		The user’s action is referred to as an event, which in turn activates a particular part of the program.
		After the software has completed the necessary response to the event, the program ‘waits’ for the next event.
	learning.unl.ac.uk /java1/lm_jav1_eventprog/lm_jav1_eventprog_t.htm (187 words)

	Event driven programming
		listeners respond to events with state-dependent state transition (behaviour)
	www.cs.cornell.edu /courses/cs202/1999fa/lecture/f99-cs202-l6/sld005.htm (9 words)

	Object Oriented and Event Driven Programming
		The early applications of object oriented programming included event-driven systems such as simulations and graphical user interfaces; those represent, to this day, the areas in which OOP techniques are most effective.
		GUIed programs typically are created using event-driven systems where all sorts of "events" can result in (processing being done).
		I would be one of the dissenters; I have never been particularly impressed by the claims of OO programming, particularly in the (typical) C++-based implementations.
	cbbrowne.com /info/eventdriven.html (877 words)

	The QP7 Programming Page: Visual Basic Tutorial
		Events of a control are also called that object's procedure, as the menu boxes in the code module imply.
		The Form_Load event is called whenever a form loads (obviously), and is where you can initialize variables and set initial properties, like load a control a rray or create mulitple instances of a form (this will sound more like english in a couple more sections).
		Everything in windows programming is set up in procedures because programs don't start from line 1 and end at line 300.
	www.geocities.com /SiliconValley/Bay/5707/vbasic.html (10549 words)

	Event Driven Programs
		Creating an application class is quite common in OO event driven environments because there is a lot of synergy between the concepts of events being sent to a program and messages being sent to an object.
		Recall that programs can be batch oriented, whereby they start, do something then stop, or event driven where they start, wait for events and only stop when told to do so - by an event.
		The events may be generated by the operating environment, as happens with virtually all GUI programs or the program itself may go looking for events as is often the case in embedded control systems such as used in cameras etc.
	www.freenetpages.co.uk /hp/alan.gauld/tutevent.htm (1441 words)

	Event-driven programming vs. multi-threaded programming
		One of the tasks of event-driven programming is to avoid blocking situations, another is to schedule the processor activities.
		The artificial event carries the result of the operation, and is added to the event system directly from the thread that executed the operation.
		First of all, multi-threaded programming has the disadvantage that every line of the program must follow certain programming guidelines, especially shared storage must be protected by mutexes such that everything is "reentrant".
	www.ocaml-programming.de /packages/documentation/equeue/users-guide/c483.html (603 words)

	Chapter 12 Event-Driven Programming
		In event-drivent programming, code is executed when an event occurs - such as a button click or a mouse movement.
		An event is an instance of an event class.
		A mouse event is generated when a mouse is clicked, released, moved or dragged on a component.
	www.mines.edu /~crader/cs261j/Liang/Chap12JB.html (400 words)

	Event-Driven Programming
		Events are handled by methods in the applet.
		Events are triggered by user actions (mouse, keyboard).
	www-unix.oit.umass.edu /~cs121/f00/lectures-f00/lecture4b/sld017.htm (16 words)

	Event driven programming language - Wikipedia, the free encyclopedia
		An event driven programming language is a programming language in which events (mouse clicks, key presses) cause portions of the code to execute.
		An example of an EDP (Event Driven Programing) is Visual Basic or VisualAge.
		Most event-driven programming environments already provide this main loop, so it needs not be rewritten.
	en.wikipedia.org /wiki/Event_driven_programming_language (355 words)

	Event-driven programming - Wikipedia, the free encyclopedia
		Programming an event driven system is thus a matter of rewriting the default trigger functions of the system, to match the required behavior.
		Event-driven programs typically consist of a number of small programs called event handlers, which are to be called in response to external events, and a dispatcher, which calls the event handlers, often using an event queue to hold unprocessed events.
		A command driven system can be viewed as a special case of the event driven model in which the system, inactive, awaits one very complex event--the entry of a command by the user.
	en.wikipedia.org /wiki/Event-driven_programming (527 words)

	Event-Driven Programming
		Programs with GUIs must respond to events, generated by GUI components, that indicate that specific actions have occurred
		A special category of classes, called listeners, wait for events to occur
		the listeners that wait for events to occur
	www.cs.toronto.edu /~krj/courses/108/lectures/lect11/chap10/tsld003.htm (56 words)

	Event Driven Programming Assignment Architecture
		At the highest level, the Event Driven Application Manager consists of an EventHandler and an Application.
		KeyBoard events are then passed to the current VisualApplication, which may act on the event according to it's own responsibilities and internal implementation.
		When the current VisualApplication finally gets the Key event, it may not be able to use it, so the VisualApplicationManager gets a second opportunity to use the event.
	www.csse.monash.edu.au /courseware/cse3400/2001-1/Prac/assgnmnt/DirEd/architec.htm (346 words)

	Event-driven Programming
		In event-driven programming the program responds to events.
		The program responds to events that the user generates in interacting with GUI components.
		If your browser is written in Java, then Swing components generate the events and Java methods respond to them.
	chortle.ccsu.ctstateu.edu /CS151/Notes/chap55/ch55_4.html (149 words)

	Object-Oriented, Event-Driven Programming
		In the object-oriented, event-driven paradigm the application code is associated with objects (the visual elements you see in the window) and the events associated with them.
		These are not associated with specific events as the subroutines in the form module are.
		A given form may contain 20 objects and there is a possibility (never realized!) for 10 to 20 events associated with each object.
	www.cs.wright.edu /people/faculty/rrea/ooed.html (388 words)

	8 Event-Driven Programming and Agents
		This can be programmed by having an "event loop", triggered for each event, which performs massive decision-making (if "The latest event was `left mouse click on button 23'" then "Appropriate instructions" else if...
		The mechanism is not just simple; it's also independent of your application, since it doesn't need to know about any particular control, event or operation (it will find them in the object structure).
		So it can be programmed once and for all, as part of a library such as EiffelVision 2 for platform-independent graphics.
	docs.eiffel.com /eiffelstudio/general/guided_tour/language/invitation-09.html (883 words)

	Event Driven Programming using Template Specializations in C++
		Event-driven code is useful when writing a library and we want the library to provide default behaviour in response to certain events, but to allow library users to provide custom behaviour to one or more events.
		There are two advantages of this approach, first no function pointer registration step is needed like in typical event-driven frameworks, and secondly the compiler can do a far better job of optimizing the call.
		This code represents how an event-driven library could be created.
	www.artima.com /weblogs/viewpost.jsp?thread=84958 (563 words)

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